Bearing for rolls of crushing-mills.



T. J ETUHTEVANT,

BEARING FOR ROLLS 0F CRUSHHJG MiLLS.

APPLICATION FiLED oars. 1912.,

MEETS-"SHEET I.

WJTNESSES [I U T. J. STURTEVANT.

BEARING FOR ROLLS OF cRusHmG MILLS.

I APPLICATION FILED 0CT.9,1912. 1 1Q; Patenteti' D60, 21, 1915.

3 SHEETSSHEET 2.

T. J. STURIEVANT. BEARING FOR ROLLS 0F CRUSHINQ MILLS.

APPLICATION FILED OCT.9, I912.

Patented Dec, 21, 1915.

3 SHEETS-SHEET 3- \m 4 V aw IIIMINWM II I Ev I I Q o 5 E \Y W M E m /N;ENTOR: m

WIDVESSES o FIoE.

THOMAS JOSEPH STURTEVANT, F WEL LESLEY, MASSACHUSETTS, ASSIGNOR T0 STURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

BEARING FOR ROLLS .OF CRUSHING-MILLS.

Specification of Letters Patent.

Patented Dec. 21, 1915.

Application filed October 9, 1912. Serial Ito. 724,887.

To all whom it may concern:

Be it known that I, THOMAS J. STURTE- I VANT, a citizen of the United States, re-

siding'at Wellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful the anvil ring by spring pressure against the material which is subjected to the crushing or pulverizing action between the hammer roll or rolls and the anvil ring. Owing to the very heavy duty which is placed on these crushing rolls, which operate, in the larger sizes of mills, under a pressure of several tons, it is necessary that the bearings should be of such a character as to reduce the resulting friction to a minimum, and it is also necessary that these bearings should be thoroughly lubricated. These rolls operate in a chamber 'which is filled with gritty dust, resulting from the pulverization of hard material. and it has heretofore been found practically impossible to exclude this gritty dust from the bearings of the rolls, so that undue wear of the roll bearings has resulted, requiring frequent renewal of parts.

The present invention has for its object to obviate this difficulty by providing an anti-friction roller bearing device for the crushing rolls, as also by providing means whereby said anti-friction roller bearing may be thoroughly lubricated and gritty dust be excluded therefrom, as will hereinafter more fully appear.

In the accompanying drawings Figure 1 is a longitudinal sectional view, partly broken away, illustrating the present in vention. Fig. 2 is a partial end view looking from the left of Fig. 1. Fig. 3 is across section of the roll and roller bearing on line 3-3, Fig. 1. Fig. 1 is an elevation, partly in vertical section, of a crushing mill embodying the present invention.

Referring to the drawings, 12 is rollsupporting shaft which nirn in place in the crushing. mill, is hung on pivoted car-' rier mounted on the end head of the frame or casing of the mill, and which pivoted carrier is acted on by spring pressure which is transmitted to the crushing roll, as fully shown and described in the patents above referred to. Mounted on the shaft 12 is an anvil or crushing roll 13 which, in practice, has a chill-hardened outer surface so as to be able to withstand the wear; the said roll having an interior bore or chamber of such asize as to receive a'series of antifriction rollers 14 interposed between the said shaft 12 and the said roll 13. The anti-friction rollers 14 are mountedv in a cage comprising end headsor. rings 15 se cured together by shouldered spacing bolts 16, riveted at their ends, the said antifriction rollers working between buttons or plugs 17 mounted in the said end impinging against the ends of the rollers 14, these buttons or plugs heads or rings and serving to limit endwise movements of said rollers. v

Attached to the inner face of the crushing roll 13, by screws or bolts 18, is a ring 19 overlapping one end of the bearing roller cage, to retain the latter within said roll, and having an interior annular flange 20 to which areattached two brass thrust rings 21, one located on each side of said flange, these thrust rings being opposite to or overlapping the end of the shaft 12. The shaft 12 is formed hollow for the purposeflof admitting lubricating oil to the bearings of.

the roll 13 from an oil cup 22 which is seecured to said shaft by a hollow screw plug 23. The said oil cup is high enough so that oil will flow by gravity to the roller bearmgs.

Screwed into the inner end of the hollow bearing shaft 12 is a hollow plug 24 having a body portion 25 provided with openings for the escape of oil and having a head portion 26 between which and the end of the shaft 12 the thrust rings 21 are located. The said plug 2t, when screwed into the said shaft 12, is locked in place and prevented from turning by a key 27 entering the end of the said shaft 12 and engaging said' plug, said key being in turn held in place by a cotter pin 28 passing through the exposed end of the said key and a projection 29 on the end of said plug. Attached to the ring 19, by screws or bolts 30,

is a cap 31 which, with the ring 19,. forms a tight closure for the inner end of the bearing chamber, to prevent the escape of oil, the said cap 31 being removable to afford access to the plug 24 which serves to hold the crushing roll and its bearings on the shaft 12. When the said plug is unscrewed and removed from the shaft 12 the roll 13 and its bearing, completely asslembled, may be slipped off the end of the siaft.

Secured to the outer face of the roll 13, by bolts 32, is a cylindrical box 33 through which the shaft 12 passes. The lower part of the chamber of said box, between the inner inwardly projecting wall or flange 3t and the outer inwardly projecting wall or flange 35, serves as a dust and oil catching trap to receive waste oil escaping from the bearing of the roll 13. The said box 33 extends outward through an opening in the end wall 44: of the casing forniing the chamber of .the'mill; and as the inner flange 34,- is somewhat deeper or higher at its lower part than the outer flange 35 the surplus oil, when the trap in the bottom of the said box is filled, will flow over the upper edge of the last-named flange, and thus be discharged or permitted to escape outside of the chamber of the mill. In crushing some kinds of material it is very objectionable to have any oil get into the pulverized product, but by virtue of the construction hereinbcfore described, and. which affords an oil tight chamber in which the bearings of the roller 13 are inclosed, oil will be prevented from entering the chamber of the mill, and any surplus oil coming from the said bearings will be discharged outside of the mill casing, and outside of the pulverizing chamber. Surplus oil may be prevented from creeping out on the shaft 12 by means of a check ring 37, of felt or other suitable material, surrounding the said shaft and retained in place by a holder 38.

From the foregoing it will be understood that the crushing roll 13 is mounted on antifriction rollers 14 running between what may be termed an outer race afforded by the inner surface of the said crushing roll and an inner race afforded by the outer surface of the shaft 12, and that while lubrieating oil may be freely fed to the roller bearings for the said crushing roll, the charm her in which said bearings are inclosed is oil tight with reference to the mill chamber, so that no oil can escape from said bearing chamber into the chamber of the mill, while surplus or waste oil will be conveyed outward and discharged outside the mill casing. It will also be understood that when it is desired to replace crushing rolls which may have become worn in use, this can readily be done by removing the cap 31 and the holding plug 24:, after which the assembled roller bearings and crushing roll may be readily slipped off from the shaft 12; while when the crushing roll. is performing its duty it will run with co1nparative ease and little friction owing to the fact that it is mounted on roller bearings which may be kept thoroughly lubricated at all times.

By reference to U. S. Patents Nos. 606,829 and 995,480, hereinbefore referred to, it will be understood that the shaft 12, carrying the crusher or hammer roll 13, will, in practice, be acted on by a spring or springs which will serve to press the hammer roll yieldingly toward the crushing face of the anvil ring, thereby cushioning the action of the hammer roll and aflording a certain elasticity to its supporting shaft or holder 12. ()wing to the fact that the hammer roll 13 will thus be yieldingly mounted, the antifriction rollers on which the said hammer roll runs are much less liable to become broken or injured in the operation of the hanuner roll than would be the case if the said roll were not thus yieldingly or elastically supported. Owing also to the fact, as shown by the patents above referred to,

that the tension of the spring or springs,

acting on thehammer rolls of the machines of the class to which the present invention relates, may be adjusted or varied, it will be understood that the hammer roll 13 will be adjustably held to its work by a predetermined pressure, and which pressure may be increased or diminished, as may be found best. This will be clearly understood by reference to Fig. 4 of the drawings in which 39 denotes the rotating mill shaft on which is fixedly mounted a spider or head 40. The anvil ring 41, with which the crushing rolls 13 cooperate, is secured to said head 40 to rotate therewith, The roll-supporting and non-rotating shafts or hearing pins 12 are mounted in carriers 42 which are pivoted, as at 43, to the removable end casing part or head 44 of the mill casing 45, these casing parts 4 and 45 forming the chamber of the mill. The carriers 42 are acted on by springs 46 acting through a three-armed spider a7, a pressure regulating screw 48, a dish 459 and ball-bearing parts 50, all as fully set forth in the patents hereinbefore referred to and also U. S. Patent No. 1,000,457, dated Aug. 15, 1911.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. The combination with a rotating member and a non-rotating shaft on which the same is mounted, of anti-friction bearing rollers interposed between the saidmember and shaft, a cage in Which the said anti-fricisomers tion rollers are mounted, a ring directly attached to one end of said rotating member and overlapping one end of said cage, ea ring serving to retain the said cage wit said rotating member so that said rotatable member and its assembled roller bearing be handled as a unit in being placed on or removed from said shaft, said ring b vine an inwardly extending flange, a tached to said shaft and having a llea tached to said ring.

' vent the same from turning, means for bolding said key in place, and a removable cap attached to said ring and which cap may be taken oil when access to said key and screw plug is necessary.

3. The combination with a rotating member and a non-rotating hollow shaft on which the same is mounted, anti-friction bearing rollers interposed between said member and shaft, a cage for holding said rollers, a ring attached to one end of said rotating memher to form an assembled connection between the latter and said cage and rollers, a plug screwed into said shaft and cooperating with said ring to secure the roll and "shaft together, a removable key for locking said plug to prevent the same from turning, means for holding said key in place, and a removable cap which may be taken ofi' when access to said key and screw plug is necessary, said plug having a duct or conduit for the passage of oil from said hollow shaft to the hamber containing said bearing rollers. i i b' 'on with rotatable member a non-rotating shaft on whi h-the is mounted, of. anti-friction bearing rollers interposed between said member and sha t, means for feeding oil to said bearing forming a chamber for said i I means for tightly closing the inn end the said chamber, a box e. to the outer face of the said rotatable er into which said chamber opens so that said box will serve as a trap to re 1 discharge the surplus oil from said e combination with a rotatable mem d a non-rotating shaft on which the same is mounted, of anti-friction bearing interposed between said member and t, means for supplyin a lubricant to said bearing rollers, walls rorming a chamber in which said bearing rollers are incl'osed, said chamber being oil-tight at its inner part but having an oil-escape opening at its outer part, and a trap to receive and discharge waste oil from said chamber.

6. The combination with a rotatable member, and a non-rotating shaft on which the THOMAS JOSEPH STURTEVANT.

l Vitnesses W'. H. Emma, L. H. Srnnrnvanr. 

